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The differential pressure sensor monitors the pressure curves created by the accumulation of soot and ash content in the particulate filter and creates scenarios in the control unit program as to how best the system should respond to the filling of the filter. However, if an error occurs in the pressure measurement, everything is different and the owner is exposed to non-standard behavior of his vehicle, which can turn into a nightmare in the form of consequences and damage to the engine, for example, or even a fire. This video will tell you how to detect a faulty pressure sensor and how it works.